UNOGRANI

Indications

• Nausea and vomiting induced by cytotoxic chemotherapy
• Prevention of postoperative nausea and vomiting

Dosage

Children: For children aged 6 months to 17 years, refer to the BNF for Children for appropriate dosing guidelines, as individual dosage may vary based on age, weight, and specific treatment protocols.

Adults: For intravenous administration, the typical adult dose is 1 mg, given before the induction of anesthesia, diluted in 5 mL and administered over 30 seconds. For prevention of nausea and vomiting related to chemotherapy, it can be given for 3-5 days as needed.

Mechanism of action

Granisetron works by selectively blocking the 5-HT3 receptors, which are involved in the vomiting reflex. By antagonizing these receptors in both the central nervous system and the gastrointestinal tract, granisetron reduces the stimulation of the vomiting center, thus preventing nausea and vomiting.

Pharmacodynamics

Granisetron's pharmacodynamic effects are primarily based on its ability to inhibit the action of serotonin at the 5-HT3 receptor sites. This action reduces the incidence of nausea and vomiting, especially in patients undergoing chemotherapy or surgery. The onset of action is typically rapid, with significant effects observed within 30 minutes to 2 hours after administration.

Pharmacokinetics

Granisetron is well-absorbed when administered intravenously or orally. It exhibits a volume of distribution of approximately 4-5 L/kg and is primarily metabolized in the liver via cytochrome P450 enzymes. The elimination half-life ranges from 9 to 13 hours, allowing for once-daily dosing in many cases. Granisetron is primarily excreted in urine, with a small percentage excreted unchanged.

Adverse effects

• Extrapyramidal symptoms
• QT interval prolongation
• Serotonin syndrome
• Decreased appetite
• Dry mouth
• Flushing
• Generalized edema
• Vertigo
• Dystonia

Precautions

• Caution is advised in hepatic impairment
• Patients should avoid sun exposure to the patch site during use and for 10 days after removal

Pregnancy

Manufacturer advises to avoid use during pregnancy.

Breast-feeding

Avoid; no information available regarding safety during breastfeeding.

Storage

Store in a dry place, protected from light. Keep out of reach of children.

Formulations

• {'formulation': 'Powder for solution for infusion', 'strength': '1 mg per 1 ml', 'pack_size': '10 ampoules'}
• {'formulation': 'Granisetron 3 mg/3 ml concentrate for solution for injection', 'pack_size': '10 ampoules'}
• {'formulation': 'Granisetron 1 mg tablets', 'pack_size': '10 tablets'}
• {'formulation': 'Granisetron 2 mg tablets', 'pack_size': '10 tablets'}
• {'formulation': 'Transdermal patch', 'strength': '3.1 mg per 24 hours', 'pack_size': '1 patch'}

Indications

• Acidulant in food and beverages
• Preservative in pharmaceutical formulations
• pH adjuster in various chemical preparations

Dosage

Children: Refer to product-specific guidelines for appropriate dosing based on formulation and indication.

Adults: Refer to product-specific guidelines for appropriate dosing based on formulation and indication.

Mechanism of action

Citric acid acts by chelating metal ions, which can enhance the solubility of certain compounds and improve their bioavailability. It also contributes to the acidity of the environment, which can influence enzymatic activity and metabolic pathways, particularly in the degradation of citronellol.

Pharmacodynamics

Citric acid exhibits mild pharmacological effects primarily attributed to its role in metabolic processes. It aids in the regulation of pH levels, which can impact enzymatic reactions and biochemical pathways. The acid's chelating properties may help to reduce the toxicity of certain metal ions in biological systems.

Pharmacokinetics

Citric acid is rapidly absorbed after oral administration and is metabolized in the liver. It undergoes conversion to various metabolites in the citric acid cycle, contributing to energy production. The elimination primarily occurs through urine, with minimal accumulation in the body.

Pregnancy

Citric acid is generally regarded as safe during pregnancy when used in food amounts. However, consult a healthcare provider for advice on medicinal use.

Breast-feeding

Citric acid is considered safe during breastfeeding when consumed in food amounts. For medicinal use, consult a healthcare provider.

Storage

Store in a cool, dry place away from direct sunlight.

Indications

• Adjustment of pH in pharmaceutical formulations
• Facilitation of drug absorption
• Used in sterile preparations

Dosage

Children: Refer to specific product guidelines for dosing information, as hydrochloric acid is typically used in a controlled setting based on formulation requirements.

Adults: Refer to specific product guidelines for dosing information, as hydrochloric acid is typically used in a controlled setting based on formulation requirements.

Mechanism of action

Hydrochloric acid dissociates in aqueous solution to release hydrogen ions (H+), leading to a decrease in pH. This acidic environment promotes the activation of pepsinogen to pepsin, an enzyme essential for protein digestion. Additionally, the acidity aids in the absorption of certain minerals and drugs that require an acidic environment for optimal bioavailability.

Pharmacodynamics

The primary pharmacodynamic action of hydrochloric acid is the maintenance of gastric acidity, which is essential for normal digestive processes. The acidic environment helps in denaturing proteins, activating digestive enzymes, and providing a barrier against pathogenic microorganisms. Its effects can influence the absorption and efficacy of various medications, particularly those that are pH-dependent.

Pharmacokinetics

Hydrochloric acid does not undergo significant systemic absorption when used in its normal contexts, as it acts locally within the gastrointestinal tract. The amount of hydrochloric acid produced by the stomach varies with food intake and physiological needs. It is secreted by parietal cells in the gastric mucosa, and its secretion is regulated by neural, hormonal, and local factors. The half-life of hydrochloric acid is not applicable as it is continuously produced and neutralized within the gastrointestinal tract.

Contra-indications

• Hypersensitivity to hydrochloric acid or any of its components
• Severe renal impairment
• Active gastrointestinal bleeding

Adverse effects

• Abdominal pain
• Diarrhea
• Nausea
• Vomiting
• Esophageal irritation
• Gastric mucosal irritation
• Electrolyte imbalances

Interactions

• May interact with alkaline substances, potentially neutralizing hydrochloric acid
• Caution with antacids as they may affect the efficacy of hydrochloric acid

Precautions

• Use with caution in patients with a history of gastritis or gastric ulcers
• Monitor electrolytes in prolonged use
• Use cautiously in patients with respiratory conditions due to potential aspiration risks

Pregnancy

Hydrochloric acid is classified as a category C drug. Use during pregnancy only if clearly needed and the potential benefits justify the risks to the fetus.

Breast-feeding

There is limited data on the excretion of hydrochloric acid in human milk. Use with caution during breastfeeding.

Storage

Store in a cool, dry place away from direct sunlight and heat. Ensure the container is tightly closed.

Formulations

• Oral solutions
• Injectable forms
• Tablets

Dosage

Children: Refer to specific guidelines for pediatric dosing; consult the BNF for Children for accurate dosage information.

Adults: Refer to specific guidelines for use; dosage may vary based on the context of use.

Mechanism of action

Hydroxide ions act primarily as bases, neutralizing acids to form water and salts. They participate in various biochemical pathways, including selenium metabolism and the degradation of reactive oxygen species. Hydroxide can influence enzyme activity and stability by altering the pH of the environment, thereby affecting metabolic reactions.

Pharmacodynamics

Hydroxide ions can impact biological processes by changing the local pH, which influences enzyme activity, ion transport, and the solubility of other compounds. Their ability to neutralize acids can help regulate physiological pH, contributing to homeostasis in living organisms.

Pharmacokinetics

As an inorganic ion, hydroxide does not undergo traditional pharmacokinetic processes like absorption, distribution, metabolism, or excretion. Instead, it is rapidly equilibrated in biological fluids and participates in acid-base reactions, having immediate effects on the local environment.

Pregnancy

There is limited information regarding the use of hydroxide during pregnancy. Consult a healthcare professional for advice.

Breast-feeding

Limited data is available on the excretion of hydroxide in breast milk. Consult a healthcare professional before use.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Indications

• Hormone replacement therapy
• Pain management
• Chronic disease management
• Certain psychiatric conditions
• Hormonal imbalance

Dosage

Children: Refer to specific product information and guidelines, as dosing will vary based on the active ingredient and clinical indication.

Adults: Refer to specific product information and guidelines, as dosing will vary based on the active ingredient and clinical indication.

Mechanism of action

Pellets can contain various active pharmaceutical ingredients that may act through different mechanisms. For example, hormone pellets release hormones such as testosterone or estrogen into the bloodstream, where they bind to specific receptors to exert their physiological effects. The controlled release mechanism allows for a gradual increase in hormone levels, mimicking the body's natural secretion patterns.

Pharmacodynamics

The pharmacodynamic effects of pellets depend on the active ingredients contained within them. For hormone pellets, the effects can include modulation of reproductive processes, alleviation of menopausal symptoms, or enhancement of muscle mass and strength in the case of testosterone. The controlled release mechanism helps maintain therapeutic levels of the drug in the plasma, which can lead to more stable and effective treatment outcomes.

Pharmacokinetics

The pharmacokinetics of pellets vary based on the specific drug formulation. Generally, after administration, pellets dissolve or disintegrate, allowing the active ingredient to be absorbed into the bloodstream. The rate of absorption and the time to peak plasma concentration will depend on the pellet's composition, the solubility of the drug, and the physiological conditions of the gastrointestinal tract or the application site. The half-life of the drug will also influence the dosing schedule and the duration of action.

Pregnancy

Safety in pregnancy has not been established. Use only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

It is not known whether this drug is excreted in human milk. Caution is advised when administering to nursing mothers.

Storage

Store in a cool, dry place, away from direct sunlight. Keep out of reach of children.